Replace Color, Select color range...

Hello,

I'm quite new to Photoshop. I'm the tech-head in my class though, and of course was asked to do some (supposedly) quick photoshop work on a design for some designs for a project our group is doing. Anyway, to get to the point, my problem is this:

Part of Picture:
www(removeme).postimage.org/image/7hwjqi4w1/

I have an image based on a pattern we scanned in. I need to change the color of the green lines, and ensure complete transparency in between them.

I have uploaded the psd of the linked picture if its easier to see from that.
http(removeme)://www(Removeme).gogofile.com/Default.aspx?p=sc&ID=634914457093281250_4882

Your advice would be highly appreciated, Im under a lot of pressure to complete this!